Method of manufacturing a nano metal wire

Abstract

Disclosed is a method of manufacturing a nano metal wire, including: putting a metal precursor solution in a core pipe of a needle; putting a polymer solution in a shell pipe of the needle, wherein the shell pipe surrounds the core pipe; applying a voltage to the needle while simultaneously jetting the metal precursor solution and the polymer solution to form a nano line on a collector, wherein the nano line includes a metal precursor wire surrounded by a polymer tube; chemically reducing the metal precursor wire of the nano line to form a nano line of metal wire surrounded by the polymer tube; and washing out the polymer tube by a solvent.

What is claimed is: 
     
       1. A method of manufacturing a nano metal wire, comprising:
 putting a metal precursor solution consisting of a metal compound and a chemical reducing agent in a core pipe of a needle; 
 putting a polymer solution in a shell pipe of the needle, wherein the shell pipe surrounds the core pipe; 
 applying a voltage to the needle while simultaneously jetting the metal precursor solution and the polymer solution to form a nano line on a collector, wherein the nano line includes a metal precursor wire surrounded by a polymer tube; 
 chemically reducing the metal precursor wire of the nano line to form a nano line of a nano metal wire surrounded by the polymer tube; and 
 washing out the polymer tube by a solvent. 
 
     
     
       2. The method as claimed in  claim 1 , wherein the polymer solution further comprises a salt. 
     
     
       3. The method as claimed in  claim 2 , wherein the salt has a concentration of 1 mg/mL to 100 mg/mL. 
     
     
       4. The method as claimed in  claim 1 , wherein the metal wire of the nano line comprises silver, platinum, gold, or combinations thereof. 
     
     
       5. The method as claimed in  claim 1 , wherein the polymer tube comprises polyvinylpyrrolidone (PVP). 
     
     
       6. The method as claimed in  claim 1 , wherein the polymer solution is jetted out of the needle with a flow rate of 0.1 mL/hr to 5 mL/hr. 
     
     
       7. The method as claimed in  claim 1 , wherein the metal precursor solution is jetted out of the needle with a flow rate of 0.01 mL/hr to 1 mL/hr. 
     
     
       8. The method as claimed in  claim 1 , wherein the shell pipe and the core pipe are concentric cylinders. 
     
     
       9. The method as claimed in  claim 1 , wherein the core pipe has a diameter of 0.5 mm to 2 mm. 
     
     
       10. The method as claimed in  claim 1 , wherein the shell pipe and the core pipe have a diameter difference of 0.01 mm to 5 mm. 
     
     
       11. The method as claimed in  claim 1 , wherein the step of chemically reducing the metal precursor wire of the nano line comprises an annealing step performed at a temperature of 100° C. to 200° C. 
     
     
       12. The method as claimed in  claim 1 , wherein the voltage is between 10 kV to 12 kV. 
     
     
       13. The method as claimed in  claim 1 , wherein a tip of the needle and the collector has a distance of 5 cm to 50 cm therebetween. 
     
     
       14. The method as claimed in  claim 1 , wherein the nano metal wire has a length of greater than or equal to 1 cm.